Pain-Free, Needle-Free Modern Immunization Options Include ___________________

Pain-free, needle-free modern immunization options include ___________________. (Select all that apply)

A) using a patch of short microneedles
B) using a gene gun to inject cDNA particles into host tissues with a quick puff of helium gas
C) nasal spray mists to protect against measles by activating lymphocytes in the host nodes
D) consumption of genetically modified foods designed to deliver antigens to activate lymphocytes in the GALT